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NiCo2S4@graphene nanocomposites as high-performance cathode materials with enhanced rate capability for Lithium-ion batteries

Mursaleen ShahidDepartment of Industrial Engineering, University of Trento, ItalyAmtul BasitDepartment of Materials Science and Engineering, Institute of Space Technology, Islamabad, 44000, PakistanNayan BanikDepartment of Physics Northern Illinois University, Dekalb, IL 60115, USATaimoor AbbasInstitute of Environmental Science and Engineering (IESE), National University of Science and Technology (NUST), H-12 Campus, Islamabad, 44000, PakistanRenu SharmaDepartment of Chemistry, University Institute of Sciences, Chandigarh University, Mohali, Punjab, IndiaS. GanesanDepartment of Chemistry and Biochemistry, School of Sciences, JAIN (Deemed to be University), Bangalore, Karnataka, IndiaC. SuryaDepartment of Chemistry, Sathyabama Institute of Science and Technology, Chennai, Tamil Nadu, IndiaSubhashree RayDepartment of Biochemistry, IMS and SUM Hospital, Siksha 'O' Anusandhan (Deemed to be University), Bhubaneswar, Odisha-751003, IndiaBekzod MadaminovDepartment of General Professional Sciences, Mamun University, Khorezm, UzbekistanMirjalol Ismoilov Ruziboy UgliDepartment of Transport Systems, Urgench State University named after Abu Rayhan Biruni, Urgench, Uzbekistan

Results in Chemistryjournal2025en

ABI

Аннотация

In this study, we present the preparation and electrochemical performance (ECP) of NiCo 2 S 4 @graphene nanocomposites as high-performance cathode materials for lithium-ion batteries (LIBs). Hydrothermal synthesis in a single step was employed to fabricate the composite, enabling uniform anchoring of NiCo 2 S 4 nanoparticles on the graphene matrix. Structural characterization using XRD, Raman spectroscopy, SEM, and BET investigation revealed the successful formation of the composite with a mesoporous architecture and improved surface area. Electrochemical testing revealed that the NiCo 2 S 4 @graphene electrode delivered a high initial discharge capacity (DC) of 113.4 mAh g −1 at 0.1C, significantly surpassing 97.5 mAh g −1 observed for pristine NiCo 2 S 4 . Under a high current rate (CR) of 5C the composite achieved 58.02 mAh g −1 , whereas the unmodified sample reached only 27.78 mAh g −1 , confirming its improved capability for fast charge and discharge. EIS showed a marked reduction in charge transfer resistance (R CT ) from 138 Ω (NiCo 2 S 4 ) to 64 Ω (NiCo 2 S 4 @graphene), highlighting improved interfacial charge transport. Additionally, capacity retention after 30 cycles at various current rates was 95% for the composite, compared to 91% for pristine NiCo 2 S 4 . The enhanced electrochemical behavior stems from the integrated contribution of the interaction between the conductive graphene matrix and the redox-active NiCo 2 S 4 nanoparticles, which together improve electron mobility, structural stability, and ion diffusion. This outcome underscores the suitability of NiCo 2 S 4 @graphene composites for high-performance LIB applications.

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Advancements in Battery Materials Extraction and Separation Processes Advanced Battery Technologies Research

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DOI: 10.1016/j.rechem.2025.102700

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